243668166 has 64 divisors (see below), whose sum is σ = 578866176. Its totient is φ = 66931200.

The previous prime is 243668149. The next prime is 243668177. The reversal of 243668166 is 661866342.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121266 + ... + 123258.

It is an arithmetic number, because the mean of its divisors is an integer number (9044784).

Almost surely, 2^243668166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243668166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289433088).

243668166 is an abundant number, since it is smaller than the sum of its proper divisors (335198010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243668166 is a wasteful number, since it uses less digits than its factorization.

243668166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2117.

The product of its digits is 248832, while the sum is 42.

The square root of 243668166 is about 15609.8739905228. The cubic root of 243668166 is about 624.5965746395.

The spelling of 243668166 in words is "two hundred forty-three million, six hundred sixty-eight thousand, one hundred sixty-six".